XM Satellite Radio Holdings Inc. declared Oct. 7 a regular quarterly dividend on its 8.25 percent Series B Convertible Redeemable Preferred Stock. The dividend is payable in shares of XM’s Class A Common Stock at a rate of $1.0313 per share of Series B Preferred Stock owned, with fractional shares to be paid in cash. The dividend is payable to shareholders of record as of Oct. 21.